/Engine/Source/Runtime/Engine/Classes/Kismet/GameplayStatics.h
Returns the launch velocity needed for a projectile at rest at StartPos to land on EndPos. Assumes a medium arc (e.g. 45 deg on level ground). Projectile velocity is variable and unconstrained. Does no tracing.
static bool SuggestProjectileVelocity_CustomArc ( const [UObject](API\Runtime\CoreUObject\UObject\UObject) * WorldContextObject, FVector & OutLaunchVelocity, FVector StartPos, FVector EndPos, float OverrideGravityZ, float ArcParam )